Push cart

ABSTRACT

A push cart comprises  includes a main frame, a handle, a front support, two wheel frames, two wheels, and a retractable rod and a rear support , wherein the main frame has a pair of side rods connected with a pair of rods of the handle in a slidable manner, the center portion of the main frame is connected to each other,  and the lower portion of the main frame has  is connected with a  the wheel frame  frames and a wheel respectively  the wheels. The lower respective ends  portion of the main frame are  is connected with respective ends  sides of the front support which then meshes with the wheel frame  frames. The respective lower ends of the handle are connected with one end of the retractable rod whereas the other end of the retractable rod is connected with the inner center portion of the front support, thus,  support. Thus, by operating the handle, the retractable rod is linked to move which then links  the front support and the wheel frame to retract or to expand.

FIELD OF THE INVENTION

This invention relates to a push cart, and more particularly, to a cartwhich can be operated by the handle to retract or to expand a frontsupport and a at least one wheel frame.

BACKGROUND OF THE INVENTION

In order to produce a compact easy to carry compact, easy-to-carry pushcart, various prior art carts arewere made in compact size, by foldingeach parts of a cart, cart; however, such design still possesses manydefects. Later, a compact push cart was developed which comprises ahandle that is foldable against the supporting rod and to link wheels tocollapse inwardly or to expand inwardly, inwardly; however, the supportwill still be needed to operate manually retraction of different partsare operated separately.

OBJECT OF THE INVENTION

ThisIt is the primary object of the present invention to provide a pushcart which is easy to operate.

It is another object of the present invention to provide a push cartwhich structure is more solid and more compact.

It is a further object of the present invention to provide a push cartwhich is less expensive to produce.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and additional features and characteristics of the presentinvention will become more apparent from the following detaileddescription considered with reference to the accompanying drawings, inwhich like reference numerals designate like elements and wherein:

FIG. 1 is a perspective view of the present invention;

FIG. 2 is an enlarged view of a snap plate of the present invention;

FIG. 3 is a side view similar to of FIG. 2when the push cart is inoperation;

FIG. 4 is a rear perspective view of the present invention in a foldedstatus;

FIG. 5 is a perspective view similar to FIG. 4 with a support in openingstatus;

FIG. 6 is a perspective view of the present invention in partiallyoperating status;

FIG. 7 is a is an enlarged view of circle A of FIG. 6;

FIG. 8 is a rear perspective view of the present invention in an openstatus; and

FIG. 9 is a side view of the present invention in an open status.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, a push cart of the present invention comprises amain frame 1, a handle 2, a front support 3, two wheel frames 4, twowheels 5, a retractable rod 6 and a rear support 7. The interconnectedrelations are such that, the main frame 1 has its upper respective sidesslidably connected with the lower respective sides of the handle 2, themiddle portion of the main frame 1 is connected with the respectivesides of the rear support 7 while the lower portion of the main frame 1is connected to the wheel frame 4 which then connected with a pair ofwheels 5. The respective lowermost ends of the main frame 1 areconnected with the respective ends of the front support 3 which thenmeshes with the wheel frame 4. The center portion of the handle 2 isconnected with one end of the retractable rod 6 which has its other endconnected to the inner center portion of the front support 3. Byoperating the handle 2, the retractable rod 6 is linked to retract or toexpand the front support 3 and the wheel frame 4.

The main frame 1 comprises a U-shaped rod 11, two fixtures 12, twosupporting rods 13, two sockets 14, a cross bar 15 and a pulling spring16. The lower ends of the U-shaped rod 11 are connected with one end ofeach fixture 12, the other ends of the fixtures 12 are secured with thesupporting rods 13, respectively. Each supporting rods 13 has a pullingspring 16 which connects to a pin 121, the U-shaped rod 11 has a pair ofsockets 14 being connected to a cross bar 15 at its respective ends.

The handle 2 is a reversed U-shaped and comprises two sliding seats 21,a cross bar 22, a lock 23, a torque spring 24 and a snap plate 25. Thehandle 2 is inserted at its two ends to the sockets 14 of the main frame1 and secured with two sliding seats 21 which are also inserted throughthe U-shaped rod 11 so that the main frame 1 and the handle 2 areslidable against each other. The two sliding seats 21 are interconnectedby a cross bar 22 which includes a lock 23 at center, as shown in FIGS.2 and 3. The lock 23 includes a tube 235 in horizontal position havingextending upwardly and downwardly, a pair of plates from respectiveends, the ends. The downward end plate of the tube 235 has a throughhole (not marked) and is secured to the upper portion of an outer tube61 of the retractable rod 6 by a fixed pin 231, the 231. The upperplates of the tube 235haveare formed with a stopper 232 and two holes233 and 234, the 234. The torque spring 24 is formed with spiral coiland a pair of bars 241 extending from respective sides thereof and areversed U-shaped snap ring 242 at center of the rod 241, the 241. Thesnap plate 25 has a slope surface 251 at its top portion and a recess252 at the rear end thereof, the thereof. The snap plate 25 comprises ahole 254 at the respective lower sides, and a stopper 253 at the frontposition, the position. The torque spring 24 is connected to the lock 23by inserting a pin 241 through the hole 233, and a pin 243 through hole234 and the center of the torque spring 24, the 24. The snap plate 25 isbuckled to the tube 235 of the lock 23 by the cross bar 22 with the snapring 242 of the torque spring 24 seat in the recess 252 of the snapplate 25, whereas the stoppers 232 and 253will block each other when thesnap plate 25 is pushed rearwardly to a predetermined angle.

The front support 3 is in a plate form having and has a pair of hinges31 extending upwardly from the respective ends, each ends. Each hinge 31is formed by two horizontal plates 311 which are inserted by the lowerend of the supporting rod 13 of the main frame 1 and secured by a pin 32therein. Each hinge 31 has a plate 311having formed with teeth 312, andthe front support 3 has a rib 33 at its bottom portion for theconvenience of operating the cart when fully loaded.

The wheel frame 4hasis connected to the wheel 5 and is connected to thelower end of the supporting rod 13, the 13. The wheel frame 4 has alsoteeth 41 corresponding to and meshes meshing with the teeth 312, by themeshing of the teeth 312 and 41, such that when the front support 3 ismaking horizontal or vertical movement, the wheel frame 4 can be turnedleft or right in a horizontal direction.

The retractable rod 6 includes an outer tube 61, an inner tube 62, astopper 63 and a C-snap ring 64, whereas the inner tube 62 is slidablyinserted in the outer tube 61 and has formed with a stopper 63 at thetop portion, the portion. The stopper 63 has a larger outer diameterthan the outer diameter of the inner tube 62 but smaller than the innerdiameter of the outer tube 61, a 61. A C-shaped groove 631 is formed onthe top of the stopper 63, and the 63. The outer tube 61 has an inwardlybulge portion 611 and a the C-snap ring 64atengaged with the lower endof the inner tube 62which is connected to the center front portion ofthe front support 3.

The rear support 7 is a plate having connected with a locating bar 71which center portion will be clipped by the C-snap ring 64, therespective sides of the rear support 7 are secured to the pin 121 of thefixture 12, and the pulling spring 16 has one end secured to the rearsupport 7, whereas the other end of the pulling spring 16 is secured tothe supporting rod 13 which lower end is secured by the pin 32 so that aretract force is applied on the rear support 7.

To operate the present invention, as shown in FIGS. 4 and 5, push thehandle 2is pushed towards the main frame 1 to retract reduce the length,when length of the cart. When when the retracting pushing of the handle2has reached a certain degreeto a lowest position, the outer tube 61 andthe inner tube 62will retract simultaneously, uponsubstantiallytelescope with full length of each other. Upon the groove 631 of thestopper 63 of the inner tube 62reachesinterlocks with the pin 231 of thelock 23, a further pushing force will activate the retractable rod 6 tolink the front support 3 to turn, whereas the teeth 312 of the hinge 31mesh with the teeth 41 41, that links the wheel frame 4 to retract andreturn into the main frame 1.

On the other hand, to expand the cart, by pulling the handle 2outwardly, the retractable rod 6 will extend too, as shown in FIG. 6.When the outer tube 61 and the inner tube 62 have reached to theirextremity, as shown in FIG. 7, the stopper 63 of the inner tube 62 willbe stopped by the bulge portion 611, 611. By applying a continuouspulling force on the handle 2 at this moment, the retractable rod 6 willexpand the front support 3 and the meshing of the teeth 312 and 41 willbring the wheel frame 4 to expand too, as shown in FIG. 1. Furthermore,the pulling force of the handle 2 with respect to the main frame 1, 1causes the snap plate 25 of the lock 23willto clip the cross bar 22 ofthe handle 2that(that confines the handle 2 from retraction. StillFurthermore retraction). Even more, when the rear support 7 is in expandposition, as shown in FIGS. 8 and 9, the respective ends pull thepulling spring 16, and the locating bar 71 will be clipped by the C-snapring 64 of the retractable rod 6 which prevents the rear support 7 fromreturning to its retractable position.

The principles, preferred embodiments and modes of operation of thepresent invention have been described in the foregoing specification.However, the invention which is intended to be protected is not limitedto the particular embodiments disclosed. The embodiments describedherein are illustrative rather than restrictive. Variations and changesmay be made by one skilled in the art without departing from the spiritof the present invention. Accordingly, it is expressly intended that allsuch variations or changes which fall within the spirit and scope of thepresent invention as defined in the claims, be embraced thereby.

I claim:
 1. A push cart comprising a main frame, a handle, a frontsupport, two wheel frames, two wheels, and a retractable rod and a rearsupport , wherein said main frame having the respective sides connectedto respective sides of said handle in a slidable manner, the centerportion of said main frame being connected to respective sides of saidrear support, the a lower portions of said main frame being connected tosaid wheel frames which then are connected to said wheels, respectively,the lower ends of said main frame being connected and to respectivesides of said front support, Further, the respective sides of said frontsupport comprising teeth, and said wheel frames having teethcorresponding to and meshing with said teeth of said front support, saidhandle having its respective ends connected to one end of saidretractable rod, and the other end of said retractable rod beingconnected to the an inner center portion of said front support, thus,such that by operating said handle, linking thereby engaging saidretractable rod and with said front support and said wheel frames tomove simultaneously.
 2. The push cart as recited in claim 1, whereinsaid main frame comprising a U-shaped rod, two fixtures secured to therespective a lower ends portion of said U-shaped rod, two supportingrods connected to said fixtures, respectively, two sockets, and a crossbar and two pulling springs, each said supporting rod having a torquespring which has one end secured to said supporting rod while the otherend of said torque spring being secured to said rear support , each saidfixture comprising a pin, and said sockets being connected to saidU-shaped rod and having a the cross bar extending in between.
 3. Thepush cart, as recited in claim 1, wherein said handle shape like isshaped as a reversed English letter U, comprising and includes twosliding seats, a cross bar, a lock, a torque spring, and a snap plate,wherein two respective ends of said handle are inserted into respectivesockets of said main frame and secured with said sliding seats of saidmain frame respectively, said sliding seats are inserted throughrespective ends of said U-shaped rod, a said cross bar being is setbetween said sliding seats, and a the lock being is set on said crossbar, said lock being and connected to said torque spring and said snapplate, said snap plate having a slope surface .
 4. The push cart, asrecited in claim 1 3, wherein said lock havinghas a stopper at a top endthereof, and said snap plate having ahas at least one stopper at itsalower left andor right positions, respectivelythereof.
 5. The push cart,as recited in claim 1, wherein said front support having has a pair ofhinges extending from the respective ends sides thereof, and each hingehinges the said front support to one lower ends of each said of twosupporting rods of the main frame, and each hinge having has teeth,meshing with corresponding teeth of said wheel frame hinged to the lowerend of said supporting rod, and said wheel frame corresponding to saidteeth of said rear support having formed with teeth for meshing togetherframes.
 6. The push cart, as recited in claim 1, wherein saidretractable rod comprising comprises an outer tube, an inner tube, astopper and a C-snap ring, whereas said inner tube being is sleeved onsaid outer tube in an sliding manner, and said inner tube having has astopper at its a top end which comprises thereof, the stopper has anouter diameter slightly larger than the an outer diameter of said innertube and smaller than the an inner diameter of said outer tube, saidstopper comprising comprises a C-shaped groove at its a top end thereof,and said outer tube having has an inner bulge portion, said outer tubehaving a and the C-snap rig ring at the a lower end and the lower end ofsaid outer tube being connected to the center portion of said rearsupport thereof.
 7. The push cart, as recited in claim 6, furthercomprising a rear support, wherein the lower portion of said main framebeing connected to respective sides of said rear support, and a lowerend of said inner tube is connected to the inner center portion of saidfront support.
 8. The push cart, as recited in claim 2, furthercomprising a rear support, wherein the center portion of said main framebeing connected to respective sides of said rear support.
 9. The pushcart as recited in claim 8, wherein said main frame further comprisestwo supporting rods, and each said supporting rods having a pullingspring which has one end secured to said supporting rod while the otherend of said pulling spring being secured to said rear support.
 10. Thepush cart as recited in claim 1, wherein a length of the retractable rodsubstantially varies in order to retract the front support and thewheels to the main frame.
 11. The push cart as recited in claim 10,wherein the retractable rod includes tubes telescopingly engaged to varythe length of the retractable rod.
 12. The push cart as recited in claim1, wherein the wheels are retracted by rotating about the main frame.13. A push cart comprising a handle, a main frame, a front support, twowheels, and a retracting means, wherein the main frame has a left sideand a right side being connected to respective sides of the handle in aslidable manner, and a lower portion being connected to the frontsupport and one side of each of the wheels such that the retractingmeans retracts the front support and the two wheels to the main framesimultaneously, and a length of the retracting means substantiallyvaries in order to retract the front support and the two wheels to themain frame.
 14. The push cart according to claim 13, wherein theretracting means is connected to a upper portion of the main frame andan inner center portion of the front support so as to retract the frontsupport and the wheels simultaneously.
 15. The push cart according toclaim 14, wherein each of the wheels has a gear, and a right side and aleft side of the front support each has at least one gear to mesh withthe gear of each of the wheels respectively.
 16. The push cart accordingto claim 13, wherein the retracting means is shaped as a rod.
 17. Thepush cart according to claim 13, wherein said connection between atleast two of the main frame, the front support, the wheels, and theretracting means is provided by at least one pair of meshing gears. 18.The push cart according to claim 13, wherein said main frame includes aU-shaped rod, two fixtures secured to a lower portion of said U-shapedrod, two supporting rods connected to said fixtures respectively, twosockets, and a cross bar, each said fixture comprising a pin, and saidsockets being connected to said U-shaped rod and having a cross barextending in between.
 19. The push cart according to claim 13, whereinsaid handle has two ends connected to one end of said retracting means,and the other end of said retractable means is connected to an innercenter portion of said front support such that said retractable means,said front support and said wheels are linked to move simultaneously byoperating said handle.
 20. The push cart according to claim 13, whereinsaid handle is shaped like a reversed English letter U and has twosliding seats, and two ends of said handle are respectively insertedinto two respective sockets of said main frame so as to be secured withthe two sliding seats of the handle.
 21. The push cart according toclaim 13, wherein said handle further has two sliding seats, a crossbar, a lock, a torque spring, and a snap plate, said sliding seats areinserted through respective ends of said U-shaped rod, said cross bar isset between said sliding seats, and said lock is set on said cross barand connected to said torque spring and said snap plate.
 22. The pushcart according to claim 21, wherein said lock having a stopper at a topend thereof, and said snap plate having at least one stopper at a lowerleft or right position thereof.
 23. The push cart according to claim 13,further comprising two wheel frames for connecting the wheels to themain frame, wherein said front support has a pair of hinges extendingfrom respective sides thereof, and each hinge hinges said front supportto one lower end of each of two supporting rods of the main frame, andeach hinge has teeth meshing with corresponding teeth of each of saidwheel frames.
 24. The push cart according to claim 13, wherein saidretracting means comprises an outer tube, an inner tube, a stopper and aC-snap ring, wherein said inner tube being sleeved on said outer tube ina sliding manner, and said inner tube having a stopper at a top endthereof, the stopper has an outer diameter slightly larger than theouter diameter of said inner tube and smaller than the inner diameter ofsaid outer tube, said stopper comprising a C-shaped groove at a top endthereof and said outer tube having an inner bulge portion and a C-snapring at a lower end thereof.
 25. The push cart, as recited in claim 24,further comprises a rear support, wherein the lower portion of said mainframe is connected to respective sides of said rear support, and a lowerend of said inner tube is connected to an inner center portion of saidfront support.
 26. The push cart, as recited in claim 13, furthercomprising a rear support, wherein the right and left sides of said mainframe are connected to respective sides of said rear support.
 27. Thepush cart as recited in claim 26, wherein said main frame furthercomprises two supporting rods, and each of said supporting rods has apulling spring which has one end secured to said supporting rod whilethe other end of said pulling spring being secured to said rear support.28. The push cart as recited in claim 13, wherein the retracting meansincludes tubes telescopingly engaged to vary the length of theretracting means.
 29. The push cart as recited in claim 13, wherein thewheels are retracted by rotating about the main frame.